Piston-expanding machine



Nov. 15, 1949 Filed Aug. '23, 1946 A. J. DAVIS PISTON-EXPANDING MACHINE2 Sheets-Sheet l Ina/1210! A82 0 Jfiaw's,

"-4 5's H /$7 M l 4 Attorneys Filed Aug. 23, 1946 A. J. DAVISPISTON-EXPANDING MACHINE 2 Sheets-Sheet 2 E I E [in Inventor Alia Jflaws /4 %7%MM,,6WWQMW Attomzqys Patented Nov. 15, 1949 UNITED STATESPATENT OFF 1 CE PISTON EXPANDING MACHINE Alto J. Davis, Montgomery, Ala.Application August 2-3, 19%; Serial No. 692,670

This invention relates to piston expanding machines or furnaces operatedby gas or the like burners and adapted to expand the piston whencon-fined therein by the application of heat to the same.

It is the object of the invention to provide a piston-treating furnacewhich is provided with a simple means-for vertically adjusting thesupporting member for the piston relative to the heating flame, wherebyto impart or adjust the flame relative to its: point of application tothe piston being treated.

It is another object of the invention to provide an adjustablepiston-supporting frame for such furnaces which can be simply adjustedby turning a screw which is located exteriorly of the furnace, andwhereby the adjustment may be made while the furnace is still inoperation and without necessity of cutting off the gas flame.

It is another object of the invention to provide with a. piston-treatingfurnace a supporting structure for the piston holder which isparticularly" adapted to contain the holder while retaining the piston,or to retain the. holder alone without the piston.

According to the invention the furnace includes a shell with an openingtherein through which the piston to be treated can be inserted. Thiscasin has a bottom on which there is provided a pair of hollow studsadapted to receive the downwardly extending pins. in telescopic fashionon a supporting table on which the piston is rested. The supportingtable is hollow and is engaged-- at its under portion with a forkshapeclmember which is pivoted within the furnace at a. point slightly removedfrom the supporting frame and extends exteriorly of the furnace to a.point where it can be adjusted by a hand screw carried on a bracket onthe furnace wall. By this construction the piston can be raised andlowered relative to a burner extending upwardly through the bottom ofthe furnace. While the present structure discloses a gas burner; it willbe understood. that the heatin can be effected by an electric heater ifso desired.

Below the front Opening there is connected a rearwardly extending shaftor hollow sleeve having a notch at its outer end and a camminghand-operated member thereon adjacent the notch and adapted to enter thesame to make secure a piston holder adapted to lie Within the notch.Intermediate the length of the sleeve and slightly removed from thefront of the furnace, there is connected for vertical adjustment in thesleeve a rod which is bifurcated at its upper end 2 Claims. (CL.263'e-5.)

2 and adapted to receive the holder in placing the same thereover whennot in use- For other objects: and for a better understanding of theinvention, reference may be had to the following detailed descriptiontaken in connection with the accompanying: drawings, in which:

Figure l is a longitudinal cross-sectional view showing the interior ofthe furnace and the parts for'effecting the vertical ach'nstmem of thepiston supporting' table.

Figure 2: is transverse cross-sectional view taken along the line 2-20]?Figure 1,. and look.- ing downwardly and. in the direction. of thearrows thereof.

Figure 3 is. a side ele atirmalview with por tions broken away to. showthe interior parts of the. furnace and to. show the. manner in whichthe; piston-holder bracket can be connected to the furnace. on. thefront thereof.

Figure. a is. a detail: fragmentary and cross-sectional view of thesleeve at. its notched end and illustrating. the two positions of theretaining cam associated therewith.

Figure 5- is a. detail view, in crossesection, through the supportingsleeve on the exterior of the. furnace; and illustrating the manner inwhich the supporting rod maybe clamped in any one of its verticallyadjusted positions. tothe sleeve.

Figure 6. is a perspective view of the entire arrangement looking uponone side. and into the front thereof and showing particularly the.arrangement of the supporting sleeve: and the parts thereof.

Referring now to: the; figures; II]: represents a furnace casing havinga bottomv II vertically spaced. from the bottom edge of the casing. Thebottom, edge of the casing issupported upon leg members l2 held. againstlateral. separation. at. the bottom. by a cross structure- I3, Figure 6.The legs I2 may have feet I4; thereon adapted, to; be connected: to thefloor on which the apparatus is: supported and so; 851170 permit itslateral; creeping along the floor surface;

In the bottom II is a central opening I5 up through which extends a gasburner I6 adapted to deliver a heat-treating flame to the center of thepiston. The burner I6 is supplied by gas fittings I1, and its operationis controlled by a pull-rod I8 connected at its front end to a valve I9and which extends to the front of the burner where it will be accessibleto the operator.

The opening I5 is closed by a plate 2| secured to the bottom face of thebottom I I by clamping bolts 22. On the top of the bottom there eadjusted from the exterior of the furnace and without cutting down theburner flame at the time. This structure comprises ahorizontallydisposed lever 27 operatively connected to the table orplate 25 and actuable from without the casing ID for causing verticaladjustment of the table relative to the burner I6. 21 is bifurcated, asat 28, and is mounted for pivotal movement about a horizontal axis orpivoted at 29 to a vertically extending stud post 3| on the bottom II.The bifurcated ends are pivoted, as indicated at 32, to the undersurface of the ring 25. By having the bifurcated portion 28, the lever21 will not be in the way of the flames issuing from the burner IS. Thelever 27 extends through the casing ill to the exterior thereof. On theouter surface of the casing there is provided a bracket 33 having at itsouter end an adjusting screw 34 adapted to engage the outer end of thelever to effect the adjustment thereof. A guard member 35 on the bracket33 keeps the end of the lever in registration with the lower end of thescrew 34. Referring now to Figures 3 to 6, on the front of the casingthere is connected a flanged sleeve bracket 36 which has threaded intoit a pipe 31 having a notch 38 in its outer end and a cam locking member39 pivoted thereon to cooperate with the notch 38 to retain a pistonholder 40 in a fixed position. This piston holder 40 carries a piston 4|in such fashion as its interior can be easily examined. The holder 40comprises a ring formation 42 and clamping elements 43 extending throughthe sides thereof for engagement with the side of the piston 4|. Whenthe piston is removed from the furnace, it can be clamped to the holder40. The clamping element 39 is pivoted at 34 and has a serrated camportion 45 adapted to bear against the portion of the holder whichenters the slot 38.

When the holder 40 is not in use, it may be temporarily supported on afurther supporting arrangement on the sleeve 35. This other arrangementis shown particularly in Figure 5, and comprises a vertically adjustablerod 46 having a bifurcated top end 41 on which the piston holder can behung. The rod 46 is retained in position by a clamping screw 48 havingan operating handle 49 and extending through a second portion 50.

While various changes may be made in the detailed construction, it shallbe understood that these changes shall be within the spirit and scopeThe lever 4 of the present invention as defined by the appended claims.

I claim:

1. A piston treating apparatus comprising a vertically-disposed furnacecasing having a bottom provided with an aperture extending therethrough,a plurality of supporting sleeves arranged in spaced relation projectingupwardly from said bottom and carried by the latter, a piston-supportingtable mounted in superimposed relation on said bottom, said table havinga plurality of pins arranged in spaced relation and projecting from itsunder-face thereof, the pins being in bearing engagement with thesleeves ,ofsaid bottom, there being an aperture extending through saidtable, the aperture in the table being positioned in alignment with theaperture in said bottom, a burner extending through the bottom apertureand having its tip located beneath said table, and ahorizontally-disposed lever operatively connected to said table andactuable from without said casing for causing vertical adjustment of thetable relative to said burner.

2. A piston treating apparatus comprising a vertically-disposed furnacecasing having a bottom provided with an aperture extending therethrough,a plurality of supporting sleeves arranged in spaced relation projectingupwardly from said bottom and carried by the latter, a piston-supportingtable mounted in superimposed relation on said bottom, said table havinga plurality of pins arranged in spaced relation and projecting from itsunder-face thereof, the pins being in bearing engagement with thesleeves of said bottom, there being an aperture extending through saidtable, the aperture in the table being positioned in alignment with theaperture in said bottom, a burner extending through the bottom apertureand having its tip located beneath said table, a horizontally-disposedlever mounted for pivotal movement about a horizontal axis having oneend secured to said table and having its other end extending exteriorlyof said casing, and means on the other end of said lever for effectingpivotal movement of the latter to thereby cause vertical adjustment ofthe table relative to said burner.

ALTO J. DAVIS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 854,974 Wiecke May 28, 19072,017,423 Walker Oct. 15, 1935 2,025,707 Consolazio Dec. 31, 19352,379,627 Davis July 3, 1945 FOREIGN PATENTS Number Country Date 1,582Netherlands Oct. 2, 1916 330,844 Great Britain June 19, 1930

